Jamba
AI21's hybrid SSM-Transformer family, built for long context.
At a glance
Current release
From the release row Jamba2. Pricing page lists 'Jamba Mini'; docs map jamba-mini to the 2026-01 version 2 model
Family record: Official documentation · 5 Sep 2026
Built on it
1 product in this catalogue names this family on their own pages.
Releases
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Jamba
52B-total, 12B-active mixture-of-experts SSM-Transformer with a 256K context window, released with open weights under Apache 2.0.
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Jamba 1.5
Jamba 1.5 Mini and Large, 256K context, released under the Jamba Open Model License.
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Jamba 1.6
Jamba Large 1.6 and Mini 1.6 with a 256K context window.
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Jamba 1.7
Jamba Large 1.7 and Mini 1.7, described as enhanced grounding.
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Jamba Reasoning 3B
3B on-device reasoning model (AI21-Jamba-Reasoning-3B) in the hybrid SSM-Transformer design.
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Jamba2
Jamba2 Mini (52B total, 12B active) and Jamba2 3B, 256K context, Apache 2.0, aimed at enterprise grounding and instruction following.